Jul 21, 2026 05:17 PM
https://www.psychologytoday.com/us/blog/...ndard-time
INTRO: For years, sleep scientists have documented many problems with daylight saving time (DST), which requires changing clocks twice a year. After time changes, incidences of adverse cardiovascular events and mood disorders increase, and the frequency of vehicular crashes rises.
Our bodies are entrained by daily light and dark periods, and even the one-hour shift in timing of sunrise and sunset can disrupt the circadian system. Schools and businesses do not adjust start or end times on transitions. Changing the clocks on Sunday is meant to ease the time transition, but one day is not enough time to be effective.
After reviewing years of study, a panel of 23 scientists published a paper that laid out the evidence for permanent standard time (Rishi et al. 2020). Both the American Academy of Sleep Medicine and the American Medical Association favor permanent standard time.
The problem with DST is that it is inconsistent with circadian physiology. Late evening light, along with early morning darkness, causes a phase delay in the endogenous system. Chronic misalignment has been associated with increased risk of obesity, metabolic syndrome, heart disease, and depression. The misalignment is worst in the westernmost areas of time zones where sunset occurs later in clock time... (MORE - details)
INTRO: For years, sleep scientists have documented many problems with daylight saving time (DST), which requires changing clocks twice a year. After time changes, incidences of adverse cardiovascular events and mood disorders increase, and the frequency of vehicular crashes rises.
Our bodies are entrained by daily light and dark periods, and even the one-hour shift in timing of sunrise and sunset can disrupt the circadian system. Schools and businesses do not adjust start or end times on transitions. Changing the clocks on Sunday is meant to ease the time transition, but one day is not enough time to be effective.
After reviewing years of study, a panel of 23 scientists published a paper that laid out the evidence for permanent standard time (Rishi et al. 2020). Both the American Academy of Sleep Medicine and the American Medical Association favor permanent standard time.
The problem with DST is that it is inconsistent with circadian physiology. Late evening light, along with early morning darkness, causes a phase delay in the endogenous system. Chronic misalignment has been associated with increased risk of obesity, metabolic syndrome, heart disease, and depression. The misalignment is worst in the westernmost areas of time zones where sunset occurs later in clock time... (MORE - details)
